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GST calculator

Add or remove GST and see the CGST, SGST and IGST amounts.

  • Runs in your browser
  • No sign-up

Then you can

How to use the GST calculator

  1. Choose Add GST to a price or Remove GST from a price.
  2. Enter the amount and pick the GST rate: 5%, 12%, 18% or 28% (3% and 0% are also listed).
  3. Read the headline price, then the net price, GST amount, the CGST and SGST halves, IGST and gross price.

Amounts are shown with two decimals and Indian digit grouping.

The formulas

Adding GST: GST = amount × rate ÷ 100, and total = amount + GST.

Removing GST: net = total ÷ (1 + rate ÷ 100), and GST = total − net.

The second formula surprises people. A price tag of 1,180 that includes 18% GST does not hide 18% of 1,180 (212.40). The GST is 18% of the smaller, pre-tax price 1,000, which is 180.

Worked example

A shop sells a printer for 11,800 including 18% GST. What is the pre-tax price?

  • Net price = 11,800 ÷ 1.18 = 10,000.
  • GST = 11,800 − 10,000 = 1,800.
  • CGST = 900 and SGST = 900 for a sale inside the state.
  • If the buyer is in another state, IGST of 1,800 is charged instead.

Going the other way, adding 18% to 10,000 returns exactly 11,800, so the two modes always agree.

Which slab applies

The slab depends on the item or service, not on the seller. Many everyday food items are at 0% or 5%, a lot of packaged goods and services sit at 12% or 18%, and luxury and sin goods are at 28%. The calculator does not decide the slab. It does the arithmetic once you know it.

Good to know

  • Round-off: the GST is rounded to two decimals, and the net plus GST always equals the gross exactly.
  • Invoices must show CGST and SGST separately for intra-state sales.
  • This is a calculation aid, not tax advice. Check current rates with a professional.

To work out a sale price first, use the discount calculator. For any other ratio, try the percentage calculator. Planning a loan for the purchase? Open the EMI calculator. Everything stays in your browser.

Questions

How do I add GST to a price?

Multiply the price by the rate and add it. For 1,000 at 18% the GST is 180 and the total is 1,180.

How do I remove GST from a GST-inclusive price?

Divide the total by 1 plus the rate. 1,180 ÷ 1.18 = 1,000, so the GST inside it is 180. Subtracting 18% of 1,180 would be wrong.

What are CGST and SGST?

For a sale within one state, GST is split equally between the Centre (CGST) and the state (SGST or UTGST). At 18% each is 9%.

When is IGST charged?

On sales between states and on imports. IGST equals the full rate, so 18% goes to the Centre in one piece.

Which GST slabs does the tool offer?

0, 3, 5, 12, 18 and 28 percent. Slabs change from time to time, so confirm the rate for your product before filing.

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